Method and system for changing forward traffic channel power allocation during soft handoff
AssigneeQUALCOMM Incorporated
InventorEdward G. Tiedemann, Jr.
Life of this patent
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Abstract
A system and method for adjusting forward traffic channel power allocation in a communications system, wherein signal qualities of pilot channels respectively transmitted by multiple base stations in an active set of a mobile station, are measured by the mobile station, compared to a signal quality standard, and the comparison results reported to a system controller, thereby to indicate which of the pilots at the mobile station surpass the standard. The system controller then adjusts the forward channel power allocation based on the comparison results.
Claims42
A method for adjusting forward traffic channel power allocation in a communications system, comprising the steps of:
- measuring at a mobile station respective signal qualities of pilots respectively transmitted by a plurality of base stations in an Active set of said mobile station;
- comparing said respective signal qualities of said pilots to a standard, said standard determined in response to said signal quality of at least one of said pilots in said active set and a delta value of signal quality, wherein said delta value is a representative of a fixed signal level below a strongest pilot signal level of said pilots;
- reporting a message to a system controller indicating which of said pilots at said mobile station equal or surpass said standard;
- and
- adjusting said forward traffic channel power allocation based on said message.
A communications system, comprising:
- a plurality of base stations which transmit respective pilots and respective code channels comprising a forward traffic channel;
- a system controller communicatively connected to said plurality of base stations;
- a mobile station which has said plurality of base stations assigned to an active set thereof, comprising,
- a diversity receiver which measures respective signal qualities of said pilots,
- a processor which produces a signal quality standard and prepares a message indicating which of said signal qualities of said pilots equal or surpasses said standard, said standard determined in response to said signal quality of at least one of said pilots in said active set and a delta value of signal quality, wherein said delta value is a representative of a fixed signal level below a strongest pilot signal level of said pilots;
- a mobile transmitter that transmits said message to said system controller either directly or via said plurality of base stations;
- and
- said system controller adjusting a transmit power level of said forward traffic channel in response to receiving said message.
An apparatus for changing forward traffic channel power allocation, comprising:
- a mobile unit comprising,
- means for measuring respective signal qualities of signals transmitted by a plurality of base stations,
- means for generating a signal quality standard based on said signal qualities measured by said measuring means and a delta value of signal quality, wherein said signals are pilot signals, wherein said delta value is a representative of a fixed signal level below a strongest pilot signal level of said pilot signals,
- means for generating a bit vector listing base stations having measured signal qualities not less than said standard, each of said base stations in an active set of said mobile unit,
- a transmitter that transmits said bit vector;
- and
- means for adjusting said forward channel power allocation of said plurality of base stations based on said plurality of based stations identified in said bit vector.
Dependencies are inferred from the claim text.